Watermark PDF - Image Quality

I've run into a dilemma with adding a Watermark to scanned PDF files. Before adding the Watermark, they print in a wonderful grayscale with a healthy white background. After adding the watermark, all whites in the document turn a little green, even when I run the PDF through the Quartz grayscale filter.
The watermark is also black and white. I've set it at 20% opacity.
Thanks for any advice you can give.
Powerbook G4 Mac OS X (10.4)

Hi there,
it sounds like the PDF's are originally "Greyscale" and when the Watermark is added it is converting it to RGB !
Edit: I have just tried it, after the workflow is run the PDF with the watermark is now RGB !
Do you have Photoshop or Graphic Converter...you will have to add an action at the end to convert back to Greyscale !
regards
Ric

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